Patent
1987-09-28
1989-02-14
Miller, Stanley D.
350331T, G02F 113
Patent
active
048042544
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement in a display invention relates to an arrangement in a display or instrument board of the LCD kind, preferably for use in a coach, or similar vehicles, or other installations. It is previously known to use instrument boards of the LCD kind, among others in private cars with said LCD display provided with a fixed electrode pattern to display fixed images and/or in fixedly defined segments which are controllable, e.g. to show the gradually increasing speed of the car, if desired, in the form of dot matrixes permitting curves to be drawn by the aid of electronic means to show the relation between operative parameters. Also, displays were previously disclosed with said methods in combined arrangements.
Previously disclosed inventions are based on plane parallel wafers having a LC liquid an another spacer means between said wafers to maintain the plane parallel arrangement in large display areas.
An essential disadvantage of this kind of LCD displays in connection with cars is that they have to be specially made, and that the amount of information that may be presented on the display is very limited, which latter fact is not the least important disadvantage.
The requirement of a plane parallel arrangement represents an essential disadvantage in displays to be used as instrument boards in cars and the like, both because this imposes limitations on the design, and because a plane shape is unfortunate as regards reflections from light in the surroundings.
In cars of recent design information is displayed to an increasing degree via the dash board of the car. Some instruments may be difficult to read, whereas other instruments only present information of interest in case of a crisis arising or being imminent.
There is, thus, a demand for providing a display or instrument board in connection with, especially cars or the like, which may have a curved surface with a radius of curvature that may be selected, which display or instrument board can yield the information necessary for driving, and can, at the same time provide information that is necessary when a crisis or a dangerous situation arises or is imminent, or other secondary information that may be of use to the driver of the vehicle.
According to known technology glass fibres are mainly used for spacer material in the cell gap in LCD boards. If flexible LCD-boards or cells are desired, glass fibres cannot be used for spacer material because glass fibres may break if the cell is flexed. The sharp-edged material may then damage the orienting layer or cause short-circuits between both wafers In all these cases the optical appearance of the display will be impaired or even destroyed.
Contrary to rigid cell walls, flexible cell walls require considerably more spacer material, especially for displays as mentioned above which have a large area, e.g. 350.times.350 mm, to maintain the cell gap constant within narrow limits. A spacer material of high density is, thus, necessary. Glass fibres may not be used when high density is required because it will be impossible to avoid that fibres extend across each other. This will cause a larger cell gap, or if the cell wafers are compressed when sealed fibres may break and the sharp-edged portions will cause the difficulties mentioned above.
High density of glass fibres will also impair the optical appearance of transmission in the off-condition because fibres having a diameter between 6 and 10 .mu.m have a length of 30-60 .mu.m, i.e. they are visible.
All mentioned disadvantages of the previously known spacer material may be avoided with use of mono-disperse plastic spheres, e.g. "Dynospheres.RTM.", and such mono disperse plastic spheres may, especially, be provided over a large area. Spheres having a diameter of e.g. less than 10 .mu.m will remain invisible to the naked eye, in contrast to glass fibres having the same diameter
An improvement as to the total stability of a flexible LCD-cell may be achieved if said mono disperse plastic spheres, especially of the kind known as "Dyno
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Doll Werner
Kamfjord Thor G.
Marthinsen Jan E.
Autodisplay A/S
Miller Stanley D.
Pellman Anita E.
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